An audiovideo device and a method of controlling the operation thereof, which visualize operation states in or among AV devices into a flow of content. The body 18 has an inner surface 26 with a plurality of radial grooves 28 spaced apart along the length of the body 18 in the form of groove clusters 30. The main frame includes a first side over which additional conveyor units are added to the conveyor train and a second side. The samples of the input signal are acquired by the signal sampler according to the divided reference signal. Intake and exhaust chambers are connected to the intake and exhaust systems via respective conduits. The feed device includes a setting mechanism for adjusting both the control frequency of the essentially periodic AC high voltage and the amplitude of the essentially periodic AC high voltage in accordance with a set control frequency.